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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c8fab7909aa6398601bdc4c9bc61ee1902bc0f07a105cea774a1f26e11fd82c' 
  AND token = 'A+/L/73EyOtVi0Qs64qQX/GTFrnLGMJe6hs6t5I7OPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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