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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02d8961d4047428268e9e2e1efdee2cdde3c34a909a9a3e6ac74898ed31e0301' 
  AND token = 'W/Rlzd7Z3ejS9XJEJ97hByxhAWTEp+UikgNZ2wSshHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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