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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b25aac93dca3e4ddeabe0a406ec4095ae8fd26cb58fdd388667aa12fc631ca3' 
  AND token = 'wdl+igy6/Lh9DNSMKMCJwkOVsOHiVLNbLpbIAoPDjGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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