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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58b4713bfbb32680986455bc5bae5e874ae510858d69bda313760586914915e' 
  AND token = 'EmLeTzrIkR7zDGN+e8tttU8wtDIwVRAkVdwscCnt3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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