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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db75b389f8a1fcf17005b3a81e2b30b5adc25c337bafd76976f1c4b27dd2b88e' 
  AND token = 'acbJdgw+0oppr0Cc2cc167bET2Kg8g1M6WvmjbIS5+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}