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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0501593498815c2d5ffde17ba5f168b1a054cb85f15776fa27b2c3f4b28d44f' 
  AND token = 'vf3ESpqX8PjUzzla/We3FdGd17o6JOHxAcED72HPmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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