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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ff05f11b17f13860efe49dd1a42cb851cd2a13c34ae12ffe7ff78b1e114aafc' 
  AND token = 'EfahFdgEeOYbq+qB1SLtBaKKp7qa8Ve9kkhHtS7ZRhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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