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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f4bb1d69b83d9dd1e3d23695f9e1a2447c0e22cd90c45f5919f6387762e890b' 
  AND token = 'rC5ImN0gnvfAWX4LKbadxCAO9r3lXM1Sl6njyfJLaNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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