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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1f633c2d5c5d49e22f0976c8d63745879012a2b249d9ff811343b4d5177c5ed' 
  AND token = 'b4c1P2wfRYLQ5K205cEyOF0gnuZbOAsQRH5Vwtf6vhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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