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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5870fa4f8b7035511865e5ba33a1eac547fa12860835bc3d01ce2a8cc3f0ba24' 
  AND token = 'nOQkUKu1pbyEtLI6r5wjA4xgjHDf7RoULsx0twOcQ0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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