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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ba677ac7336de5e88f3b96fda87b1d9d1065de16a530b3a30f818edf9991a79' 
  AND token = 'bo/9+wXlFv3N2IuIhpRyQqTivmZT7+zpaTQcKSzst/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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