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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e08463fe4487314d765a3039ad8fdb0c177bccee97f9188ea1b95f3d691b81' 
  AND token = '76B4HPol4jz0tASy8qhtWEHOfU6xiu3gieafKTT3WwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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