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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75bf084be235ec8517159b46dc48bed7306bd2f91ae527c1844956ee6f9e8382' 
  AND token = 'AREpz441OTXRaYw3gMIl2ajU5qWJ4S7OOOe+1qgG+u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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