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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc6ff6fca2f1dac56ef8028e526b73b3a698ff9c0abe6844fcb2b19d74fdea69' 
  AND token = '4s513kLkaLp19/baFHaE6BbKXh5UrqYkyMk6mnIquqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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