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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e706e0441fbea10f12d12afad2e68e11ce50449c8e707109e82ff8559bb06760' 
  AND token = '0Rmic/o/cvz3Pc6zsTUyKicnf9u1QXuY2ayl/D4aXC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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