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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95a3c66a0ccce22c7064dddce565daf9fefab491e3b5d0d31edfe9c2a260ad1d' 
  AND token = '5cJnkQkzv+LDqq6x8kowumSmSWun//UZBWYS+vSR4cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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