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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f45cf910dac36a1e4a0a587949540b9ecb6cb3dc2eb7a7ea841ae149389ac06c' 
  AND token = 'DfoYRZMiL3opVHER5vidFmgFPfsuTCXt3ETnn7+OOvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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