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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecdebea75a858132f5b4f2c49df9bc290b344245c43ef1a5f889c4b58d0b0f46' 
  AND token = '27yMtYr1FrAVnOrkafCLlyZAW4qgImYnK6qDy9aa/4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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