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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c86cf2b82913c6b144264f43f581edc7aa9a8155aeccae47412708a3c3a4eb1' 
  AND token = 'rfrSo2hExHCzgdYSX3GRDP+d4BRbHo3GElGEYg7gxjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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