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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd6c8ca02f95c41b3a42a653b88d263b1fc4d93a3878e18768fe497d950e8384' 
  AND token = 'a1C+/Lni2eI1sSnZdCYT2jYNswZtNV2/8FN4NkdNedM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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