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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1d53624259dbd98ade4c06e0d99e0f5e7af91fb75501633ddba0e8cf541b15' 
  AND token = 'DlerRP4aJkVw/fkyQvW117E50Rk2KSfbpn3T12HwtJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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