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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a018f87cf6dcdc07f3fc3d2196d97e0d0efd11c4f3503678bc26f372264af2' 
  AND token = 'nghCmDh2wpQ7yo41O8aXbyZu9pA2VOX0KUnREUQ4H/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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