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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76dd216cc7eb77038360f14fbad0aaabdfcad6dedfa7ce11e86ad5fbaa73c585' 
  AND token = 'vRr/XLvGabhDrllic+rIGfFPO63cCV3p+yGg+kOjCI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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