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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3b091f2aa5c8a067360cf76c3ff72830f7f549a35caab4d4364a8cf43ad4cfb' 
  AND token = '0Vn5Elu4Ef+GpYm3c2t8eDiljN1+pOMKnFDvLHOdQmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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