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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ca837d41a460dc9bbe71688fd088f2ab8026d89be3f5aad79db5dde20ef221b' 
  AND token = 'IspBblCNZ/1DyOTUq2a0ppARLvUv1L1fWcclorlknoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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