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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea2d56f91bc6f0b19ca264b6176886ac6c0d9eb2493e1dc4e3ec80d50c890ea1' 
  AND token = 'gzWr4rhUq50ArqG6EpuqJUKC9k9zZo/+r2FNo8F6iUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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