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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d3331f9000905180e22be4295230a3a914f8ae920b3d78f4f7f0f19ad4a3723' 
  AND token = '9i1nIacvrNgE7KYTdm7gTGU2AoqbdF+pvioYnGMz10k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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