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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4712a58052985f6628689540e9b807369964e602f883617ddaac1e0e5241854f' 
  AND token = '32rbfjwqDG1bd3DLirgq9D4ZFqMNiKodyze7gj0sYAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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