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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7b62f155d29f1521f242a2b69c32964de657c87a63873a761f35b0d3e06a9e8' 
  AND token = '0IX7iUbUdn28Re+k9JgtZTzqD7JODTYdV7gSMq7wyzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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