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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a75ac6b5241d92166cebdefc6ed5ecf3d00da503158dc2dfe7514dd959a106db' 
  AND token = 'fPR2ztlEDSf/mKBAVXXAPQFnBfK+P9WdtFLY6PAmrAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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