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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a85abd90921f8e9d5c67a97327afc11d27987a195150c455f6e68dfcc82d5cd' 
  AND token = 'eIdJHKijcxr51xmS7zu5RidiBrWiLRFRZrcAuJUPKAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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