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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f00b2a309dd063721000df64db6cb178b5f9c5d374f68193ee6d55ac3045f937' 
  AND token = '3VC8G+3boW9QT+maz4lMVjRyqQidQZxDis8dKQ+Q/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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