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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1153047b8ade0f311147900531517a2e4eb768d9239963bcfd1016bea493f5f' 
  AND token = 'C7HQ7D316+Ri+DSD2oyeaskqtlJFf3t3WE0bhl0O2DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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