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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd0ee6192e874f1a5b51b7eb0d39b0ca0dcae6ae56391227a38bbc6018a84b89' 
  AND token = '6Aasr0M3zR3e7OBgmxCZWP8mfYcXkFHo883AsvKLfu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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