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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '316b9eceb84a65898e547a3471251d5648b9bf26a3115921042f859f40e972b0' 
  AND token = 'MeqSa+2c2p50TWEZ/rUJDEfbcucUNDtrwzXl+Gb/nhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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