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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b00258257fe64fbfce44634df5da8536f42e4309a0ffab9b3a56c60fdad91567' 
  AND token = '0czYWMrhA3eAGKhEpC4UKaEjzZ4OA9UhQOBJA7hY360=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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