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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cbf368fac17c250826bbc8ee43ce70bab3688b67de94acfb78bcc1364eff18d' 
  AND token = 'Mr7s+ncRaciUVT3RCp971dGto1cs2PzI1OfXBoTV7Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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