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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f49c67f7a33a64c0e69906d4e06084888797a1f53539944840c39b04980b4d9' 
  AND token = 'bA+rk4v3O2LYY58UuxFcaIAVJ9hb5GmUShxaR0hV+O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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