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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5affa524b84f9b07b2460739f04b88203496c9a7391d302e63e567ae95751adc' 
  AND token = 'Ca0WHZp5q4A7RKQlk1A/kCPe1dp7ctQkrF2JKe2IL/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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