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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37e188a63c2957abebca858575a7e54693ed882bd06e820609a5dc888f9ceae7' 
  AND token = 'U7T5LdqoLboV+GWGHKKg+8yjnmb3oSvdpB7Bn1c4uic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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