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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0982c13259c5ba9837cd17c9dc1320591304ffd5bd20318f225277ed4b46c61' 
  AND token = 'bN+/4tHYaZRQ2g0H78AnwCS7Mdd65ztkZS0D1x3zTHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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