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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa92da4c3dbc5ef6812a5a4eda7976a4794aae7173a2d86ac0c9a243523f975c' 
  AND token = '3AwWY0O2bixQU6cO5k/SmXpjCeO2+TeCMIk48NYvtc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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